Daikin VRV IV+ RYYQ14U7Y1B Series Installer And User Manual page 73

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F: Piping between refrigerant branch kit and branch selector box (BP box)
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1B – 2020.10
a
b
a Outdoor unit
b Main pipes (increase if the equivalent piping length is ≥90 m)
c First refrigerant branch kit
d Piping between refrigerant branch kit and indoor unit
e Indoor unit
HP class
8
10
12+14
16
18~22
24
26~34
36~54
(a)
If the size-up size is NOT available, you must use the standard size. Sizes bigger than the
size-up size are NOT allowed. But even if you use the standard size, the equivalent piping
length is allowed to be more than 90 m.
(b)
Pipe size-up is NOT allowed.
The pipe thickness of the refrigerant piping shall comply with the applicable
legislation. The minimal pipe thickness for R410A piping must be in accordance
with the table below.
Pipe Ø (mm)
6.4/9.5/12.7
15.9
19.1/22.2
28.6
34.9
41.3
In case the required pipe sizes (inch sizes) are not available, it is also allowed to
use other diameters (mm sizes), taken the following into account:
-
Select the pipe size nearest to the required size.
-
Use the suitable adapters for the change-over from inch to  mm pipes (field
supply).
-
The additional refrigerant calculation has to be adjusted as mentioned in
determine the additional refrigerant
Pipe size for direct connection on branch selector box (BP*) must be based on the
total capacity of the connected indoor units (only in case RA  DX indoor units are
connected).
e
d
c
Size up
Piping outer diameter size (mm)
Gas pipe
19.1 → 22.2
(a)
22.2 → 25.4
(b)
28.6
(a)
28.6 → 31.8
(b)
34.9
(a)
34.9 → 38.1
(b)
41.3
Minimal thickness t (mm)
amount" [
18
Piping installation
|
Liquid pipe
9.5 → 12.7
12.7 → 15.9
15.9 → 19.1
19.1 → 22.2
0.80
0.99
0.80
0.99
1.21
1.43
4
 98].
Installer and user reference guide
"To
73

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